I think the thing that is putting off a lot of people is the fact that for a comperable price to this deal ($3100++) you can get a known entity (Blitz). Even though the offer price is abouy 25% off the list for this kit, the fact that that "special" price includes several pretty onerous requirements is putting people off.
As others have proposed...in order to get this thing off the ground PE will need to make the deal much better for the first convert to this kit.
I understand PE needs to make money and cover development costs, but PE needs to take into account the value of the feedback and advertising they will be getting in return, including the probable costs to the individual who gets the kit as a result of a few days off work to attend car shows and to get some dyno time, not to mention the install time (I work on Saturdays

).
I would venture to guess that the number of boosted yariss' has doubled in the last 12 months thanks to the blitz kit, and the market, though a little weak at the moment, is still ready for a real competitor to the blitz kit.